State the Newton's second law of motion in words and in mathematical form. If a net external
force acts upon a particle, what is the ratio of the force to acceleration?
What is Newton's second law also called?
A truck of 2 000 kg mass moving at a velocity of 12 m s-1 slide 15 m before it comes to a stop
after applying the brakes. Find the resisting forces of the brakes.
(8-Marks)

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.